Sofa



FIG. 1 is a front, top, and right side perspective view of a sofa, showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a right side view thereof; and,

FIG. 6 is a cross-sectional view taken along the line 6-6 in FIG. 2.

The rear view and the left side view are omitted because they are the same as the front view and the right side view, respectively. 

CLAIM The ornamental design for a sofa, as shown and described. 